Professional manufacturer of thermoforming machines.
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Professional manufacturer of thermoforming machines.
How the Seven Components of a Thermoforming Machine Work Together
1. Clamping Device
The clamping device secures plastic sheets in place during molding. Standard plastic thermoforming machines feature adjustable clamping devices to accommodate sheets of various sizes, while some models integrate a complete clamping frame assembly.
Clamping device can be divided into two categories: one is the frame type, the other is divided into flap type. The frame-type clamping device consists of two frames, one above and one below. The sheet is clamped between the two frames. When the frame is opened, the lower frame generally remains fixed. The lower part of the upper frame of various types of thermoforming machines is fixed directly on the moulding chamber. On manual and semi-automatic thermoforming machines, where blanks are loaded and finished products are taken out by hand, when the size of the frame is very large, a safety operation device is installed within the opening range of the frame. For the moulding of blanks with large slip, it is required that the clamping force can be adjusted within a wide range, for this purpose, two rubber-coated rollers are used, which are pressed against each other with springs and are equipped with a pressure adjustment device. The clamping of the continuous sheet pulling 3 Stations thermoforming machine is the joint action of the two side zips and the front and rear gates.
Clamping device should preferably adopt automatic control, in order to move quickly, can help to improve the quality and efficiency of the parts.
2. Heating System
thermoplastic plastic sheet and film vacuum suction moulding process, one of the main processes is sheet heating. The duration and quality of electric heating depends on the structure of the heater, the thermal inertia of the temperature transfer after the radiation surface, the distance between the sheet and the heater, the absorption coefficient of radiant energy, the characteristics of the surface of the heater as well as the thermophysical properties of the material. Commonly used heaters are electric heaters, crystal radiators and infrared heaters.
3. Vacuum System
vacuum system consists of vacuum pumps, gas storage tanks, valves, pipelines and vacuum gauges. The gas storage tank is usually a cylindrical box welded with thin steel plate with an oval bottom. The capacity of the gas storage tank should be at least half the capacity of the largest moulding chamber. Vacuum piping, must be equipped with appropriate valves to control the capacity.
The rotating power of the vacuum pump is determined by the size of the moulding equipment and the moulding speed. The size of the vacuum central system depends on the specific production and development requirements of the factory.
4. Pneumatic System
Pneumatic system can be formed by the 3 stations thermoforming machine itself with a compressor, storage tanks, shop mains set, valves and other components.
Compressed air in addition to a large number of should be used in the moulding, there is when a part for the demoulding, the first products outside the cooling and manipulation of the mould frame and running sheet and other machine parts such as the power of action.
5. Cooling Device
In order to improve the production efficiency of plastic thermoforming machine. Ideally, the inner and outer surfaces of the parts in contact with the mould are cooled, and it is best to use the internal cooling coil of the mould. For non-metallic moulds, such as wood, gypsum, glass fibre reinforced plastic, epoxy resin and other moulds, because it can not be water-cooled, can be changed to air-cooled, and can be added to the water mist to cool the outer surface of the vacuum forming parts.
6. Demoulding Device
demoulding is to move the products out of the mould, usually whether it is a concave or convex mould, most of the occasions are due to the shrinkage of the products cooling and tightening of the mould, so through the vacuum suction holes or blowing in the opposite direction to make it demoulded.
7. Control System
Thermoforming machine control system generally includes the vacuum forming, finishing and other processes, including instruments, meters, pipelines, valves and control of various parameters and actions. Control methods are manual, electrical - mechanical automatic control, computer control, etc., the specific selection should be based on the initial investment in labour costs, technical requirements, raw material costs, production and maintenance of equipment costs and other factors to be considered.
Professional manufacturer of thermoforming machines.
